#include <bits/stdc++.h>

using namespace std;
int compare (const void * a, const void * b)
{
  return ( *(int*)a - *(int*)b );
}

int main(){
    int n;
    long sum=0;
    cin >> n;
    int calories[n];
    for(int calories_i = 0; calories_i < n; calories_i++){
       cin >> calories[calories_i];
    }
    qsort(calories,n,sizeof(int),compare);
    for(int i=n-1;i>=0;i--){
        sum=sum+calories[i]*pow(2,n-1-i);
    }
    cout<<sum;
    return 0;
}